Qualitative Analysis (Detection of Nitrogen, Sulphur, Phosphorus, and Halogens ) NEET Questions

Organic Chemistry - Purification and Characterization of Organic Compounds

Qualitative Analysis (Detection of Nitrogen, Sulphur, Phosphorus, and Halogens ) MCQ Questions


13.
Why is Lassaigne’s extract filtered after fusion?
A.
To remove insoluble residue
B.
To remove base
C.
To cool it down
D.
To neutralize it
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ANSWER :
A. To remove insoluble residue
14.
Which gas evolves during detection of nitrogen if cyanide is formed?
A.
CO₂
B.
HCN
C.
NH₃
D.
NO₂
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ANSWER :
B. HCN
15.
Black ppt with lead acetate confirms presence of
A.
Sulphur
B.
Nitrogen
C.
Halogen
D.
Phosphorus
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ANSWER :
A. Sulphur
16.
Which of the following is not used in Lassaigne’s test?
A.
AgNO₃
B.
FeSO₄
C.
Na
D.
NaCl
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ANSWER :
D. NaCl
17.
Organic compounds with nitrogen and sulphur give blood red colour due to formation of
A.
Fe₄[Fe(CN)₆]₃
B.
FeSCN³⁺
C.
Fe₂S₃
D.
FeCl₃
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ANSWER :
B. FeSCN³⁺
18.
Phosphorus is detected in organic compounds using
A.
Silver nitrate
B.
Ammonium molybdate
C.
Nessler’s reagent
D.
Lead acetate
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ANSWER :
B. Ammonium molybdate